brain damage

a cerebral lobe

brain / head / chief, principal

leaf

to lose (possession of something) / to miss an opportunity etc. / to lose a person (following their death), be bereaved of someone

damage, injury

to damage, to injure

memory; recollection; remembrance

to remember; to memorize; to recollect

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend